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CVE-2026-6665

CVE-2026-6665 · PgBouncer buffer overflow in SCRAM

This page contains facts from public vulnerability sources. Check the original advisory before updating.

The SCRAM code in PgBouncer before 1.25.2 did not check the return value of strlcat() correctly when building the contents of the SCRAM client-final-message. A malicious backend that sends a SCRAM server-final-message with a long nonce can trigger a stack overflow.

CVSS 8.1 · High · EPSS 0.4% · Fix available

Published
Updated

Stack: system

Affected products and versions

  • pgbouncer

    Versions
    • ≥ 0, < 1.25.2: Affected (semver)

    Update to 1.25.2

  • pgbouncer Debian:12

    Versions
    • 1.18.0-1
    • 1.18.0-1+deb12u1
    • 1.19.0-1
    • 1.19.1-1
    • 1.20.0-1
    • 1.20.1-1
    • 1.21.0-1
    • 1.22.0-1
    • 1.22.1-1
    • 1.23.0-1
    • 1.23.1-1
    • 1.24.0-2
    • 1.24.0-3
    • 1.24.1-1
    • 1.25.0-1
    • 1.25.0-2
    • 1.25.1-1
    • 1.25.2-1
    • 1.26.0-1
    • 1.26.0-2
    • 1.26.0-3
    • 1.26.0-4
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • pgbouncer Debian:13

    Versions
    • 1.24.1-1
    • 1.24.1-1+deb13u1
    Affected ranges
    • ECOSYSTEM: < 1.24.1-1+deb13u2

    Update to 1.24.1-1+deb13u2

  • pgbouncer Debian:14

    Versions
    • 1.24.1-1
    • 1.25.0-1
    • 1.25.0-2
    • 1.25.1-1
    Affected ranges
    • ECOSYSTEM: < 1.25.2-1

    Update to 1.25.2-1

  • pgbouncer Ubuntu:16.04:LTS

    Versions
    • 1.5.5-1
    • 1.6.1-1
    • 1.7-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • pgbouncer Ubuntu:18.04:LTS

    Versions
    • 1.7.2-3build1
    • 1.7.2-65-g2b8e6cf-1
    • 1.8.1-1
    • 1.8.1-1build1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • pgbouncer Ubuntu:20.04:LTS

    Versions
    • 1.10.0-1
    • 1.10.0-1build1
    • 1.11.0-1
    • 1.12.0-2
    • 1.12.0-3
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • pgbouncer Ubuntu:22.04:LTS

    Versions
    • 1.15.0-1
    • 1.16.1-1ubuntu1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • pgbouncer Ubuntu:24.04:LTS

    Versions
    • 1.20.0-1
    • 1.21.0-1
    • 1.22.0-1
    • 1.22.0-1build1
    • 1.22.0-1build3
    • 1.22.0-1build4
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • pgbouncer Ubuntu:25.10

    Versions
    • 1.24.0-3
    • 1.24.1-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • pgbouncer Ubuntu:26.10

    Versions
    • 1.25.1-1
    • 1.25.2-1
    • 1.25.2-1ubuntu1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • pgbouncer Ubuntu:26.04:LTS

    Versions
    • 1.24.1-1
    • 1.25.0-2
    • 1.25.1-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

Original sources

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